内核预定义常量
这些常量在 PHP 的内核中定义。它包含 PHP、Zend 引擎和 SAPI 模块。
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PHP_VERSION
(string)
-
The current PHP version as a string in
"major.minor.release[extra]" notation.
-
PHP_MAJOR_VERSION
(integer)
-
The current PHP "major" version as an integer (e.g., int(5)
from version "5.2.7-extra"). Available since PHP 5.2.7.
-
PHP_MINOR_VERSION
(integer)
-
The current PHP "minor" version as an integer (e.g., int(2)
from version "5.2.7-extra"). Available since PHP 5.2.7.
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PHP_RELEASE_VERSION
(integer)
-
The current PHP "release" version as an integer (e.g., int(7)
from version "5.2.7-extra"). Available since PHP 5.2.7.
-
PHP_VERSION_ID
(integer)
-
The current PHP version as an integer, useful for
version comparisons (e.g., int(50207) from version "5.2.7-extra").
Available since PHP 5.2.7.
-
The current PHP "extra" version as a string (e.g., '-extra'
from version "5.2.7-extra"). Often used by distribution
vendors to indicate a package version. Available since
PHP 5.2.7.
-
PHP_ZTS
(integer)
-
Available since PHP 5.2.7.
-
PHP_DEBUG
(integer)
-
Available since PHP 5.2.7.
-
PHP_MAXPATHLEN
(integer)
-
The maximum length of filenames (including path) supported
by this build of PHP. Available since PHP 5.3.0.
-
PHP_OS
(string)
-
The operating system PHP was built for.
-
PHP_OS_FAMILY
(string)
-
The operating system family PHP was built for. Either of
'Windows', 'BSD',
'Darwin', 'Solaris',
'Linux' or 'Unknown'.
Available as of PHP 7.2.0.
-
PHP_SAPI
(string)
-
The Server API for this build of PHP.参见 php_sapi_name()。
-
PHP_EOL
(string)
-
The correct 'End Of Line' symbol for this platform.自 PHP 5.0.2 起可用
-
PHP_INT_MAX
(integer)
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The largest integer supported in this build of PHP. Usually int(2147483647).自 PHP 5.0.5 起可用
-
PHP_INT_MIN
(integer)
-
The smallest integer supported in this build of PHP. Usually int(-2147483648) in 32 bit systems and
int(-9223372036854775808) in 64 bit systems. Available since PHP 7.0.0.
Usually, PHP_INT_MIN === ~PHP_INT_MAX.
-
PHP_INT_SIZE
(integer)
-
The size of an integer in bytes in this build of PHP. 自 PHP 5.0.5 起可用
-
PHP_FLOAT_DIG
(integer)
-
Number of decimal digits that can be rounded into a float and back
without precision loss.
Available as of PHP 7.2.0.
-
PHP_FLOAT_EPSILON
(float)
-
Smallest representable positive number x, so that x + 1.0 !=
1.0.
Available as of PHP 7.2.0.
-
PHP_FLOAT_MIN
(float)
-
Smallest representable floating point number.
Available as of PHP 7.2.0.
-
PHP_FLOAT_MAX
(float)
-
Largest representable floating point number.
Available as of PHP 7.2.0.
-
DEFAULT_INCLUDE_PATH
(string)
-
-
PEAR_INSTALL_DIR
(string)
-
-
PEAR_EXTENSION_DIR
(string)
-
-
PHP_EXTENSION_DIR
(string)
-
-
PHP_PREFIX
(string)
-
The value "--prefix" was set to at configure.
-
PHP_BINDIR
(string)
-
Specifies where the binaries were installed into.
-
PHP_BINARY
(string)
-
Specifies the PHP binary path during script execution.
Available since PHP 5.4.
-
PHP_MANDIR
(string)
-
Specifies where the manpages were installed into.
Available since PHP 5.3.7.
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PHP_LIBDIR
(string)
-
-
PHP_DATADIR
(string)
-
-
PHP_SYSCONFDIR
(string)
-
-
PHP_LOCALSTATEDIR
(string)
-
-
PHP_CONFIG_FILE_PATH
(string)
-
-
PHP_CONFIG_FILE_SCAN_DIR
(string)
-
-
PHP_SHLIB_SUFFIX
(string)
-
The build-platform's shared library suffix, such as "so" (most Unixes)
or "dll" (Windows).
-
PHP_FD_SETSIZE
(string)
-
The maximum number of file descriptors for select system calls. Available
as of PHP 7.1.0.
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E_ERROR
(integer)
-
Error reporting constant
-
E_WARNING
(integer)
-
Error reporting constant
-
E_PARSE
(integer)
-
Error reporting constant
-
E_NOTICE
(integer)
-
Error reporting constant
-
E_CORE_ERROR
(integer)
-
Error reporting constant
-
E_CORE_WARNING
(integer)
-
Error reporting constant
-
E_COMPILE_ERROR
(integer)
-
Error reporting constant
-
E_COMPILE_WARNING
(integer)
-
Error reporting constant
-
E_USER_ERROR
(integer)
-
Error reporting constant
-
E_USER_WARNING
(integer)
-
Error reporting constant
-
E_USER_NOTICE
(integer)
-
Error reporting constant
-
E_RECOVERABLE_ERROR
(integer)
-
Error reporting constant.
Available since PHP 5.2.0
-
E_DEPRECATED
(integer)
-
Error reporting constant.
Available since PHP 5.3.0
-
E_USER_DEPRECATED
(integer)
-
Error reporting constant.
Available since PHP 5.3.0
-
E_ALL
(integer)
-
Error reporting constant
-
E_STRICT
(integer)
-
Error reporting constant
-
__COMPILER_HALT_OFFSET__
(integer)
-
自 PHP 5.1.0 起有效
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TRUE
(boolean)
-
See Booleans.
-
FALSE
(boolean)
-
See Booleans.
-
NULL
(null)
-
See Null.
参见魔术常量。